CFAI questions Vs Qbank difficult, face, sometimes, comparing

EastCoastJ

I find Qbank (Schweser) questions a bit tricky and difficult comparing to CFAI End of chapter problems.
I score around 80+ on CFAI text and it happens that sometimes repeatedly I do wrong the same and same Qbank question (Here I score around 60-70%)

So far I am going through FRA and Quants (I am just reading CFAI text No Schweser)

Do any of you guys face the same problem ?